Monitoring the failure stages mode of asphalt concrete mixture is important to understand and control through the fatigue life of the pavement. In this work, an attempt has been made to implement additives (4 % coal fly ash, and 2 % silica fumes) as a partial substitute of mineral filler in asphalt concrete. Asphalt concrete mixtures are prepared with 4.9 % binder and subjected to laboratory roller compaction in a slab mold. Beam specimens were obtained from the slab samples, and then practiced fatigue life test under repeated flexural stresses at 20℃ environment. Three levels of constant strain (250, 400, and 750) microstrain were implemented. The variations in the stages of failure were captured. It was noticed that implication of coal fly ash in the asphalt concrete mixture can slightly extend its fatigue life while its influence on controlling the decline in the flexural stiffness is not significant when compared with the behavior of the control mixture. At failure, the flexural stiffness of silica fumes treated mixture decline to (500, 400, and 300) MPa while the fatigue life is (200, 1250, and 5000) seconds when the implemented constant strain levels is (750, 400, and 250) microstrain respectively. Three stages of failure could be detected for fly ash treated mixture while obtaining a clear definition of the transition between the stages of failure is not easy when silica fumes were implicated into the mixture. Implication of silica fumes as partial substitute of filler is recommended for paving asphalt concrete.
Sarsam, S. (2023). Influence of Additives on the Failure Mode of Asphalt Concrete. Computational Engineering and Physical Modeling, 6(4), 80-91. doi: 10.22115/cepm.2024.449235.1289
MLA
Saad Issa Sarsam. "Influence of Additives on the Failure Mode of Asphalt Concrete". Computational Engineering and Physical Modeling, 6, 4, 2023, 80-91. doi: 10.22115/cepm.2024.449235.1289
HARVARD
Sarsam, S. (2023). 'Influence of Additives on the Failure Mode of Asphalt Concrete', Computational Engineering and Physical Modeling, 6(4), pp. 80-91. doi: 10.22115/cepm.2024.449235.1289
VANCOUVER
Sarsam, S. Influence of Additives on the Failure Mode of Asphalt Concrete. Computational Engineering and Physical Modeling, 2023; 6(4): 80-91. doi: 10.22115/cepm.2024.449235.1289
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